Physics, Chemistry and Biology: Post your doubts here!

[areebaization]

it should be 2Ag+, not 2+
2Ag2+ means Ag lost 4 e-, not 2
and in this case it should lose 2 e-

I guess it can be written in either way...she wrote the valency of the 2Ag combined

 

[thats_me]

thnx a lot dude!!!
if i hav any other question lyk this i'll ask u...

yeah sure

 

[thats_me]

CAN SBY PLZ XPLAIN WHAT IS macroscopic properties?? i'll iA be v greatful
Thank u in adv.

properties of wat?

 

[MoAwwami]

CAN SBY PLZ XPLAIN WHAT IS macroscopic properties?? i'll iA be v greatful
Thank u in adv.

In physics macroscopic properties ( as of what i know)
Are properties such as Density, Pressure (of Gases), Volume (of gases/liquids), Length (of solids) and Resistance (of wires) which change with change in temp (they could be measured, to measure temp. ex thermometer uses volume of mercury)

Hope this helped you

 

[thats_me]

how to express a double bond in a covalent diagram ??
for example , O=C-Cl2

by showing that they shared 2 pair of electrons

 

[MoAwwami]

how to express a double bond in a covalent diagram ??
for example , O=C-Cl2

Here i drew this up for u .
Notice that Chlorine still has its 7 electrons, oxygen has its 6 electrons, carbon still has its 4 electrons. that you must show.
Also that each Atoms has a total of 8 electrons (stable) = as some of its own + the ones shared.
Double bond : Pair of electrons shared (oxygen shares 2 electrons with carbon, carbon shares 2 electrons with oxygen.)

 

[queen95]

can sumone tell me the defination of a synthetic polymer and natural polymer

 

[thats_me]

can sumone tell me the defination of a synthetic polymer and natural polymer

Well, synthetic are man- made polymers, where as natural are the ones that occur in nature..

 

[NIM]

yeah sure

- Chlorine reacts with phosphorus to form phosphorus trichloride.
(i) Draw a diagram showing the arrangement of the valency electrons in one molecule of the covalent compound, phosphorus trichloride. Use x to represent an electron from a phosphorus atom. Use o to represent an electron from a chlorine atom.
This question plz

 

[Maz]

- Chlorine reacts with phosphorus to form phosphorus trichloride.
(i) Draw a diagram showing the arrangement of the valency electrons in one molecule of the covalent compound, phosphorus trichloride. Use x to represent an electron from a phosphorus atom. Use o to represent an electron from a chlorine atom.
This question plz

The drawing isn't good but i hope it helps

 

[EpicLol]

Could someone tell me how impurities ie. carbon and silicon are removed from the iron ore? FeS? Thx

 

[thats_me]

- Chlorine reacts with phosphorus to form phosphorus trichloride.
(i) Draw a diagram showing the arrangement of the valency electrons in one molecule of the covalent compound, phosphorus trichloride. Use x to represent an electron from a phosphorus atom. Use o to represent an electron from a chlorine atom.
This question plz

Here ..
phosphorus has oxidation state +3 so its ready to give 3 electron in order to be stable
Chlorine has oxidatyin state -1 so its ready to gain 1 electron to become stable
so 3 Cl needed to take 3 of P's electrons

 

[thats_me]

Could someone tell me how impurities ie. carbon and silicon are removed from the iron ore? FeS? Thx

Alright..
This happens in the Basic oxygen furnace, Here Oxygen is blown on the surface of the molten metal which oxidises carbon to carbondioxide & carbon monoxide which escape as gases. Silicon is oxidised to silicon(Vl) oxide which a solid oxide, then some Calcium oxide is added to remove this solid as slag. This slag may be skimmed off the surface..

 

[Yousif Mukkhtar]

Guys, if we were asked to define the terms Mole and Avogadro's constant, what should we say?

 

[EpicLol]

Alright..
This happens in the Basic oxygen furnace, Here Oxygen is blown on the surface of the molten metal which oxidises carbon to carbondioxide & carbon monoxide which escape as gases. Silicon is oxidised to silicon(Vl) oxide which a solid oxide, then some Calcium oxide is added to remove this solid as slag. This slag may be skimmed off the surface..

Thx

 

[EpicLol]

Guys, if we were asked to define the terms Mole and Avogadro's constant, what should we say?

The number of Carbon-12 atoms in 12 grams of the substance is the mole.....and the avagadros constant is the number of atoms/molecules......

 

[thats_me]

Guys, if we were asked to define the terms Mole and Avogadro's constant, what should we say?

Mole is the no. of particles equivalent to the particles preseint in 12g of carbon
The number of particles per mole is Avagadro constant

 

[EpicLol]

May/June 2011 Chemistry Paper 3

Q)1
Q)2ai
Q)3c
Q)4aiii
Q)5a
Q)5b
Q)5c

Sry if Im being an idiot...plz help me with those questions....thx

 

[thats_me]

May/June 2011 Chemistry Paper 3

Q)1
Q)2ai
Q)3c
Q)4aiii
Q)5a
Q)5b
Q)5c

Sry if Im being an idiot...plz help me with those questions....thx

variant?

 

[Yousif Mukkhtar]

Thanks guys, now I am done with Stoichiometry for good